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/*! \file
 *  Implementation of the parented, reference-counted double-linked list
 */

#ifndef _COMMON_XTREEPOLICIES_H_
#define _COMMON_XTREEPOLICIES_H_

#include "common/common_defs.h"

COMMON_NS_BEGIN

/*! This class defines null policy for XTreeNode (no notifications,
 *  no reference counting).
 */
template <class T> class XTreeNodeNoNotify {
public:
    // Notifications: do nothing by default
    static void notifyChildInserted(T*) {}
    static void notifyChildRemoved(void*, T*)  {}

    // Reference counting: do nothing by default
    static void xt_incRefCnt(T*) {}
    static int  xt_decRefCnt(T*) { return 1; }
};

/*! This class defines "pure" refcounted policy
 */
template <class T> class XTreeNodeRefCounted {
public:
    // Notifications: do nothing
    static void notifyChildInserted(T*) {}
    static void notifyChildRemoved(void*, T*)  {}

    // Reference counting: use RefCounted interface
    static void xt_incRefCnt(T* n) { n->incRefCnt(); }
    static int  xt_decRefCnt(T* n) { return n->decRefCnt(); }
};

COMMON_NS_END

#endif // COMMON_XTREEPOLICIES_H_

